438 THE SCIENTIFIC MONTHLY 



the lake. Many of these, which are not easily collected from the lake, 

 climb up the flat surface of this rock to transform and leave their cast 

 skins clinging there, most of them within reach from a boat anchored 

 at the foot of the vertical cliff. In an hour's collecting I gathered a 

 great number and variety of those belonging to two species of stone- 

 flies, several species of Heptagenine mayflies, three species of dragon- 

 flies, and I noted scores of adult orl-flies, Sialis infumata, entangled 

 in the spiders' webs that clung to the face of the rock. The most un- 

 expected find here was four skins of the fine Corduline dragonfly, 

 Neurocordulia obsolete. 



Doubtless there are other good collecting grounds on the lake: 

 these are the ones we know about. A single season was not time enough 

 for a very wide acquaintance. The clustered bays about the southeast 

 corner of the lake, where occur the most extensive beds of shore vegeta- 

 tion, and where we did several days' collecting, are doubtless rich fields 

 also. 



It seems a bit strange that a body of water that is so easily acces- 

 sible and that is visited annually by so many thousands of people, 

 should be so little known biologically. Apparently not even a list of 

 its fishes is anywhere available. Yet the islands are mostly state- 

 owned and are offered freely for camping sites. Three passenger boats 

 each way daily with frequent stops make any part of the lake easy of 

 access. A grocer's boat making a circuit of the camps several times a 

 week helps to solve the forage problem; and it would seem that these 

 things should bring more naturalists to this, one of the most beautiful 

 and one of the cleanest of American Lakes. 



