Chaet V. 



Graph 48 shows the positive reaction of an orange-spotted sunlish to 0.22 cc. of 

 amylene. Reactions to this drug arc usually positive. 



Graph 49 shoves the positive reaction of two minnows (Xotropis) to amylene 

 in which they appear to have selected an optimum concentration, near the center. 



Graph 50 shows the reaction of a large-mouthed black bass to water containing 

 34.4 cc. of ethylene per liter. It is clearly positive, though this concentration woulil 

 kill the fish in less than an hour. 



Graph 51 shows the reaction of a mirmow (Notropis) to water containing about 

 ten cc. per liter of acetylene. The reaction is clearly positive though the gas is not 

 fatal. 



Graph 52 shows the reaction of an orange-spotted sunfish to about ten cc. of 

 acetylene per liter; the reaction is clearly positive. 



Graph 53 shows the reaction of three orange-spotted sunfishes to a mixture of 

 carbon monoxide (1.4 cc. per liter) and ethylene (9.6 cc. of ethylene). 



Graph 54 shows the reaction of two suckers to the same solution as in graph 53. 



Graph 55 shows the reaction of an individual (Abramis) to ammonia in alkaline 

 water. The tish was i^ositive, as in acid Avater. , 



Graph 56 shows the reaction of a large-mouthed black bass to paracresol in 

 alkaline water. The general result is the same as in acid water. 



Graph 57 shows the reaction of an orange-spotted sunfish to orthocresol in alka- 

 line water. The fish was positive, as in the acid water. 



Graph 57 shows the reaction of an orange-spotted sunfish to phenol in alkaline 

 water. This and other fishes are positive, as in acid water. 



Graph 58 shows the positive reaction of an orange-spotted sunfish to naphthalene 

 in alkaline water. 



Graph 59 shows the positive reaction of a large-mouthed black bass to toluene 

 in alkaline water. 



Graph 60 shows the positive reaction of a blue-gill to gas waste in alkaline water. 



