PROTOZOAN FAUNA OF HAY INFUSIONS 219 
maintain a constant temperature throughout the work. This 
was impracticable when the observations were made and consider- 
able fluctuations in temperature occurred. However, all the in- 
fusions of the same set were subjected to the same temperature and 
consequently the relative time of appearance of the different forms 
in these is directly comparable. As the work progressed, from 
April to June, the average temperature of the room increased 
(cf. table 1), and consequently the infusions made later than April 
Ist, were subjected from the start to higher temperatures than 
the former. Thus it is impossible to compare accurately the con- 
TABLE I 
| TEMPERATURE | TEMPERATURE | | TEMPERATURE 
(F.) | (F.) | el (F.) 
DATE, 1909 eS z DATE, 1909 S | z DATE, 1909 | a z 
Si 5 3 5 = 5 
April 4 52 49 April 29 76 70 May 27 |) “71 65 
See 9506 eS 30 71 52 | 29 78 | 65 
Gay, GO ea May 1 63 60 30 vill 67 
iN 72 2 69 | 65 31 73-1 Gn 
Sa IO) seer al 3 75 | 69 June 1 iG" 70 
9 76 62 4 76 67 Br (i778 ll 66 
10 | 62 | 52 7 85 | 67 4 75 | 70 
Tan | bGee 50 8 74 | 64 || 5 70" |e 67 
12) 59) |) 50 9 AP Bil 6 68 66 
13° | 60" | 154 10 64 | 60 8 75 | 70 
14 | 66 | 58 11 66 | 64 10 74 | -65 
Sal 78) ML 162 12 73 | 60 11 79 1S 
1Gog2- alk 256 13 74) Gs 12 74 | 68 
17 |) 65%) | "55 14 75 | 66 13 Tv | 70 
Sie et Toe 15 71) Ome 14 75 | 70 
1OMt CS2R 75 16 79 | 69 15 Hom eevee 
oh 82 Gl 17 725 |-AGs 16 79 | 70 
OT al G5 457 18 66 | 60 17 80% | "70 
DOANE GT. N61 20 68° | 620i 18 74 | 70 
O30 78.265 21 Giaulas os 19 73 | 66 
PA | 63..| 53 22 61 57 20 72 | 68 
Deh TS. | 51 23 69 | 59 23 S50 ie 72 
DGeRIR NGOS ||! 15S 24 TOR wa 25 92° 1-483 
D780 ll <54 26: i 78iyh 64en 26) 895) 8S 
28 70 59 | | 
