178 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. VII. 



ones should not be taken from the lake. In one or two years they 

 would grow into large fish and be more desirable. The German Carp 

 is about the only species of fish that will increase rapidly no matter 

 when, or where, or how caught. All other species should be protected 

 and cared for during the breeding season ; and the small ones, those less 

 than X or % grown, should not be taken from the lake, but if caught 

 should be returned immediately to the water. The spawning time of 

 the Mojarras and the Large-mouth Black Bass is in the spring the 

 most of it during April, May, and June. If the laws regarding fishing 

 in Lake Amatitlan were as strict as they are in the lakes of Illinois, 

 Indiana, and others, of our northern states, the Mojarras there would 

 greatly increase in numbers. The Carp need no protection, and where 

 the volume of water is as great as it is in Lake Amatitlan, they are 

 quite sure, if introduced, to always be plentiful. Personally, I should 

 advise that Carp be not introduced into the lake. 



During a portion of January and February a maximum and mini- 

 mum self-registering thermometer was exposed at Laguna with the 

 following results. The coldest time of the day was between 3 and 

 5 A. M. The warmest was between 2 and 4 p. M. 



January 17, coldest 66 F. warmest 75 F. 



18, " 65 " " 76 " 



19, " 65 " " 76 " 

 " so, " 61 " 74 " 



21, " 60 " " 74 " 



22, " 62 " " 79 " 



23, " 56 " " 70 " 



24, " 56 " " 67 " 

 " 25, " 55 " " 66" 



26, 55 ' 64 " 



27, " 56 " " 66 " 



28, " 53 " " 65" 



30, " 58 " " 69 " 



31, " 61 " " 69 " 

 February i, " 59 " 72 " 



LAKE ATITLAN. 



Lake Atitlan is a mountain lake, whose elevation is about 5,000 

 feet above the sea. Except for the narrow pass to the south, through 

 which one passes on the road between San Lucas and Patulul, the 

 lake is surrounded by mountains, which rise directly from the water's 

 edge to an elevation of about 2,500 feet above its surface. There are 

 several small streams flowing into the lake. The largest one empties 



