19 
Report of the Laboratory of Comparative 
Pathology for the Year Ending 
February 29th, 1920. 
It has been three years since I submitted an annual 
report from this laboratory and I am glad that it is 
possible to resume the work, much of which was suspended 
during my absence in the army. My thanks are due to 
those who did the work during that time. Dr. Weidman, 
Dr. Corson- White and Miss Phelps, for continuing the 
previous system and maintaining the usual records. The 
museum of the Garden has been enlarged by the addition 
of considerable shelf space; the total collection now 
consists of 975 pathological specimens; 363 brains, 116 
alimentary tracts, 120 genitalia, and 137 ductless glands, 
these latter groups representing normal organs which 
are kept for comparisons and systematic research. 
There have been 449 autopsies during the year, of 
which 300 were birds, 147 mammals and 2 reptilia. A 
comparison of the accompanying list and above figures 
will indicate that although our mortality has risen 
slightly over last year, it is still close to the average for 
the fourteen years cited. 
Mammalia 
AND AvES 
Mammalia 
Aves 
For the Year 
Ending 
Ani- 
Per 
Ani- 
Per 
Ani- 
Per 
mals 
exhib- 
Deaths 
cent, 
mor- 
mals 
exhib- 
Deaths 
cent, 
mor- 
mals 
exhib- 
Deaths 
cent, 
mor- 
ited 
tality 
ited 
tahty 
ited 
taUty 
February 28, 1907 
1343 
346 
25 
7 
521 
109 
20.9 
822 
237 
28.8 
February 28, 1908 
1439 
275 
19 
1 
487 
84 
17.2 
952 
191 
20.0 
February 28, 1909. . . . 
1439 
267 
18 
5 
487 
98 
20.1 
952 
169 
15.6 
February 28, 1910. . . . 
1412 
250 
17 
7 
479 
90 
19.2 
933 
160 
17.1 
February 28, 1911.. . . 
1467 
318 
21 
6 
500 
93 
18.6 
967 
225 
23.2 
February 28, 1912.. . . 
1513 
360 
23 
7 
516 
105 
20.3 
997 
255 
25.5 
February 28, 1913. . . . 
1511 
309 
20 
5 
552 
124 
22.4 
959 
185 
19.2 
February 28, 1914.... 
1543 
290 
18 
9 
554 
98 
17.6 
989 
192 
19.5 
February 28, 1915. .. . 
1614 
347 
21 
5 
562 
104 
18.4 
1052 
243 
23. 
February 28, 1916.. .. 
1630 
381 
23 
3 
601 
108 
17.9 
1029 
273 
26.5 
February 28, 1917 
1798 
337 
18 
596 
90 
16.7 
1292 
247 
19.1 
February 28, 1918... . 
2019 
451 
22 
3 
629 
92 
14.6 
1390 
359 
25.8 
February 28, 1919.. . . 
2020 
370 
18 
3 
648 
114 
17.5 
1372 
256 
18.6 
February 28, 1920.. . . 
2033 
447 
21 
9 
628 
147 
23.3 
1405 
300 
21.3 
Since only a few of the reptiles and amphibians are autopsied they have been sub- 
tracted from the death list and the percentage computed on basis of mammals and birds 
only. 
