668 HENRY H. DONALDSON 
been caught much earlier and were suffering from the conditions 
under which they were kept. 
It was then not until the end of January, 1902, that a few 
freshly captured frogs were brought in and these were used for 
series 37, the last one in table 1. 
The frogs examined were selected from the dealer’s tank less 
than 24 hours before they were to be dissected, and kept in proper 
TABLE 1 
Data on frogs from Chicago, 1901-02 
| 
sats Sache | AE ee A eanstncnen ia ieee 
M. F. | | Mean | Range Brain | Cord 
| | 1901 | | 
| RMT NG | 3 | 3 | Mareh 28 | 24.7| (24.2-25.7) | 84.1] 79.5 
7 SA ae Ay BO at) April 3 | 24.8 (22.5-26.7) | 84.4 | 80.2 
Hen ee 4 | 3 | April 10° | 25.4) .(23:6-28.7)r 1), 84 ees 
a 4 4 April 16 | 26.9 | (22:9-29.4) | 84.7 | 80.7 
Se. 4 4 | April 23 | 27.0| (24.3-31.4) | 84.2 | 80.2 
Gi. 4 4 | April 30 | 25.0] (23.0-26.3) | 85.0 |-80.7 
riiee 4 | 4 | May 8 | 28.6 | (24.6-32.7) | 85.1 | 80.9 
Sis: 4 | 2) May 15 | 27.3} (24.1-29.8) | 84.4 | 80.9 
Ore! | 3S "| 4. |) May 21 | 28.1, (24.1-30.5) | 84.9 | 80.5 
ieee | 4 | 4 | May 28 | 27.2| (24.4-30.9) | 84.4} 80.4 
hs gn re | 3 3 June 4 |29.4] (24.5-33.8) | 85.0 | 81.0 
ae fare 3 June 11 | 26.1] (23.5-29.1) | 84.2 | 80.2 
13% 2 4 | June 19 | 26.4*| (21.5-30.1) | 85.0 | 80.9 
ee 4. |) 2") Jane 26 | 25.2%) (23.5-27.5) | 85.5 | 80.3 
Ares ae 21a) (FEZ ae es all seta 3 | 24.2% (22.9-25.4) | 85.6 | 80.9 
16.. 4 | 3 | July 9 | 25.1% (23.7-26.3) | 84.4 | 79.8 
ii AN A Tiley 17° | 27.9| (25.9-30.7) | 84.3 | 79.7 
1S: 4a 30 Sully 23 | 80.0} (27.3-31.4) | 84.9 | 80.7 
1Se 4 4 | July 30 | 29.3 (22.7-83.7) | 85.0 | 80.5 
205.5 4 4 August 6 | 27.0) (25.3-30.9) | 84.5 | 79.7 
Pe 4 | 4 | August 13 29.4 | (28.1-31.5) | 85.1 | 80.4 
2. 3 | 4 | August 20 | 28.0] (24.8-31.1) | 84.9 | 81.3 
rs ie Vin 3 | August 27 | 28.5) (24.9-33.6) | 84.6 | 80.4 
24... 3 3 | September 3 | 27.1) (23.6-31.2) | 84.5 | 79.0 
208 2 4 | September 12 29.2 | (24.0-32.7) | 84.1 | 79.1 
26.5 3 | 2 | September 17 | 24.9/ (22.8-25.9) | 85.2 | 80.9 
Ploeg 3 | 4 | September 24 | 28.6 (26.4-30.6) | 84.3 80.2 
287 4. |) (4. | October ) 2 | 2821 |" (@6-4-32.3)) 88-4 S056 
| 1902 | 
37 2 | 2 | January 30 | 24.8| (22.9-27.8) | 84.6) 81.1 
*See page 671. 
