Zoology. 539 
Dendroica HBtIVa....srses ossos ronas. 151 6} l-24 | May 13th 
te 130 : ¢ 1-26 a 
2 N 127 è ‘ 1-25 e 
a y 130 54 -23 | May 20th 
“ n 198i | 6.4 -2) “ 
sé sc 1373 C y ee 2 t 
p 2 167 ç 1-24 , June 4th 
Dendroica maculosa..........si:.... 1364 54 1-25 | May 13th 
5 Ae perenne jinn 107 5ł 1-20 as 
" anemia. lee 5} 1-21 | May 20th. 
Dendroica blackburnie............ 134 53 -24 - 
Seiurus aurocapillus ..............06 255 10} 1-25 | May 13th 
“3 o PE 264 1] 1-24 May 20th 
Setophaga ruticilla 594 43 | ¢ 1-13 it 
Vireosylvia olivaceus "3554 ) -39 
4 SAE ote adage 3043 | |! í -34 şi 
8 T ee ere 238 93 | ¢ 1-25 t 
Petrochelidon lunifrons 4224 1-53 | May 21st 
wor S 754 } -45 ti 
"i H on 290 8} -34 5 
Carpodacus purpureus............. .| 488 18} | < - May 10th 
Spin us tristis 181 1-27 | April 15th 
Zonotrichia leucophrys..........+. 366 e es EA 1-26 > 
i ogee ge setae ye ‘| 400 a 2a. 1-26 7 
Spizella socialis 1733 rs hoa 1-23 
Spizella pusilla. 279 Ro less 1-25 | Aprill5th 
Junco hyemalis 284 10 Q 1-28 “ 
Melospiza fasciata .........c.c0s0000. 377 2 o Peat 1-31 A 
olichonyx oryzivorus..........-+. 503 | 15} 1-33 | May 20th 
Molothrus ater 637 18} 8 1-35 | May 30th 
Cyanocitta cristata 1312 46 1-29 e 4th 
Trochilus colubris -o 1895 1-24 | Sept. 24th 
Nyctala acadica 1153 i l- ov. 2d 
ringa minutilla 8& | 6 | 145 | Aug. 16th 
Hybrid domestic canary 346} 8} 1-40 
P mestica 14 g 1-32 
i ao > we She 
Weight | Weight a A S3 
Name of Mammal. of of Beni = £8 -ag 
Brain soa 2 23 
ce Body. rain, 3 os a 
Mus musculus 318 5 Q 1-58 (June 6t 
mn a 256 6 8 | 1-43 |June 10th 
a sues 3 248 6 1 June 10th 
S Te oa i ` 295} 6 8 1-49 June lith 
permophilus tredecimlineatus | 2647 | 35} | 6 | 1-74 (June 4th 
ORES a 
Aquatic RESPIRATION IN THE Muskrat.—During the win- 
a of 1879-80 I spent much of my time trapping the muskrat, and 
ad rare opportunities for studying their habits. Ihave frequently 
observed an ingenious device, to serve as an apparatus for aquatic 
‘esplration, resorted to by the animal when driven from its burrow 
eh pond frozen over. In attempting to cross the pond under 
the ice, if the pond is too wide for the muskrat to “ hold its breath” 
