صور الصفحة
PDF

expression = 0, when the values of t, and t, are given for any particular lens. I have performed the calculation to this effect for the above example, supposing the last surface of the flint-lens only to be altered, and I find that its radius (r) must be increased by ," of an inch nearly, which is a very small quantity in 14 feet, and shews us that it is scarcely to be hoped, that we can obtain a very fine objectglass by trusting to theoretical computations solely; but that, after the general forms have been investigated for the optician, we must rely on his experience to vary his curvatures slowly until he has obtained the maximum effect of distinctness.

With respect to the actual thicknesses adopted in England, I am indebted for information to the liberality of Mr Tully and Mr Robinson; and as it is important that such information should be recorded in print, I shall not hesitate to give the full extract from Mr Robinson's reply to my letter to him requesting such information. He says: “Thinking that the best information might be obtained from Mr Tully, I called on him, and not being so fortunate as to find him at home, I left your letter, with the request that he would furnish the information you required; he has just now called on me and tells me, that there is no absolute rule for the thickness of either the concave or convex lens; that great thickness for the convex lens, if it be of crown glass, is considered objectionable on account of its colour occasioning loss of light; and its being thin is objected to, but merely because if it be ground to a sharp edge, there is danger of the edge being broken in polishing: he has just made an object-glass of 5], inches diameter, the thickness of the crown glass is at the edge # of

an inch, and that of the concave 3, and these he thinks very proper thicknesses and would not wish they should be thicker; but had these disks been thinner, they, (being of good glass,) would not have been rejected on that account; and in general, the only rule for thickness is, that it be such that the edge of the convex be not splintered in working, and the centre of the concave be not so thin as to change its form in polishing.”

XXIX. A Statistical Report of Addenbrooke's Hospital, for the Year 1837. By HENRY J. H. Bond, M.D.

Read April 30, 1838.
p

IN-PATIENTS, 1837.

NUMBER of Beds have been increased since Oct. 1, 1837, to 101.

Number of Patients in the Hospital:

Maximum... 94
Minimum ... 55
Mean ........ 71

Length of time Patients remained in the Hospital:

Mean duration 38+ days.

Admissions from January 1st, 1837, to January 1st, 1838:

Male Patients 374
Female ....... 3.11

Total... 685

Previous residence of Patients: Males. Females. Total. 164 (43 per c'.) 162 (52 per co.) 326 (47 per c'.) in Towns, Cambridge principally. 209 (57 per c'.) 149 (48 per co.) 358 (58 per co.) in the Country. 1 --- 1 residence not registered.

Number of In-Patients in 1837 discharged, including the 58 remaining from the year 1836:

Males. Females. Total. Results. (58.2 per c. on total t t 209 | of discharges.) 179 (59.4 per co.) 388 (58.7 per co.) Recovered. 38 17 55 Benefitted. 15 14 29 Discharged at their own request. 3 3 6 ............ for irregular conduct. 7 5 12 ............ as incurable. 22 (6.1 per co.) 10 (3.3 per co.) 32 (4.8 per co.) Died. 65 73 138 Made Out-Patients. 359 301 660

Mean stay in the house of the 388 discharged as recovered was 33+ days.

PER cent. prero cent. week.

Of the 660 o 7.72 Of the 388 **) 6.70 were discharged in 1 discharged... as recovered ....... ............... 11.96 - - - - - - - - - - - - - - - 13.40 ............... 2 - - - - - - - - - - - - - - - 15.30 - - - - - - - - - - - - - - - 17.52 . . . . . . . . . . . . . . . 3 ............. 15.75 - - - - - - - - - - - - - - - 16.75 ............... 4. ... . . . . . . . . . . . . 12.42 --- - - - - - - - - - - - - 13.65 ............... 5 - - - - - - - - - - - - - - - 8.63 - - - - - - - - - - - - - - - 9.79 ... . . . . . . . . . ... 6 - - - - - - - - - - - - - - - 6.06 • - - - - - - - - - - - - - - 4.89 . . . . . . . . . . . . . . . 7 - - - - - - - - - - - - - - 4.69 ............... 3.60 ......... •. . ... 8 - - - - - - - - - - - - - - - 3.48 - - - - - - - - - - - - - - - 2.83 - - - - - - - - - - - - - - 9 - - - - - - - - - - - - - - - 2.27 . . . . . . . . . . . . . . . 2.57 ............... 10 ............... 11.66 - - - - - - - - - - - - - - - 8.24 .........from 10 to 48

In-Patients remaining under treatment. Dec. 31, 1837.

Males......... 40
Females...... 48

Total ...... |ss

Number of Operations;

Lithotomy....................... 2
Amputations............ - - - - - - - - - 5
Hernia...................... - - - - - - 1
Cataract......................... 2

Excision of Mammary Gland... 2
............ Tumour........... I
Removal of Testicle ........... 2

15

OUT-PATIENTS, 1837.
Admissions from January 1st, 1837, to January 1st, 1838.

Males......... 359
Females...... 562

Total...... 921

Previous Residence of Patients:

Males. Females. Total.
208 (57 per co.) 315 (56 per co.) 528 (56 per co.) in towns, Cambridge principally.
151 (43 per c'.) 246 (44 per co.) 397 (44 per co.) in the Country.
1 1 residence not registered.

Out-Patients discharged in 1837, including 118 of 120 Patients re-
maining from 1836.
Males. Females. - Total. Results.

160 (45.9 per co.) 246 (45.5 per c'.) 406 (45.7 per co.) Recovered.
24 26 50 Benefitted.
3 2 5 Discharged as incurable.
4. 4. ............... irregular.
1 7 8 ............... at their own request.
6 (1.7 per co.) 4 (0.7 per co.) 10 (1.1 per co.) Died.
22 47 69 Made In-Patients.
129 204 333 Discharged for non-attendance.
3 - - - 3 Result not registered.
348 540 888

Out-Patients remaining under treatment, Dec. 31, 1837, males 49, females 102, total 151.

REPORT OF THE IN-PATIENTS AND OUT_PATIENT'S COMBINED. Number of Cases treated in 1837.

Deducting 41 from the 685 In-Patients who were previously under treatment as Out-Patients, and 137 from the 921 Out-Patients who were previously under treatment as In-Patients,

The number of cases treated in 1837 were 653 males, 775 females, total 1428.

Of these, there were admitted in

January...... 107. May ......... 133. September... 103.
February.... 108. June. ....... 129. October...... 114.
March........ 119. July. ....... 124. November... 128.
April......... 127. August...... 132. December ... 104.

335 males, 428 females, total 763, came from towns, Cambridge principally. 318 ...... , 347 ........ > * * * * * 665 ............ the country. Description of Patients admitted:

Male.
264 (40 per cent.) Labourers, chiefly agricultural.

110 (16 per cent.) Children living at home.

28 ... ... ... Shoemakers.
17 --------- Bricklayers.
17 ......... Carpenters.
16 ......... Servants.
15 ......... Grooms.
15 ... ... ... Porters.

15 ......... Printers.
13 ......... Tailors.

13 ......... Watermen.
9 ......... Gardeners.
8 ... ... ... Smiths.

7 ..... Waggoners.
6 ......... Brewers.
6 ......... Butchers.
6 ......... Tramps and Hawkers.
* ......... Bakers.

84 ......... Of 51 different occupations.

[ocr errors]
« السابقةمتابعة »