F. A. Goocli — Forms of Laboratory Apparatus. 239 



many places a foliated or gneissic structure. The immense 

 pressure exerted by the overlying stratiform material, and the 

 crumpling folding and fracturing of the comparatively thin 

 and weak crust consequent on the earth's cooling would all 

 tend to sink large portions of the Huronian below the line of 

 fusion, the submergence of which would produce conditions of 

 contact such as I have described to the north-east of Lake 

 Huron and which subsequent upheaval and denudation have 

 exposed. 



At other places the basement complex may have remained 

 undisturbed so that the overlying detritals though somewhat 

 altered have not been intruded or pierced by the granitic mass 

 beneath. The latter doubtless have been the conditions which 

 obtained in the localities visited by Messrs. Pumpelly and Yan 

 Hise north of Lake Huron and by me on Annima-Nipissing 

 Lake. The explorations of the past two seasons have served to 

 confirm the opinions expressed in the paper published in the 

 American Geologist and as the region then under examination 

 has just been finished, I hope to move farther west during 

 the coming summer and explore the district visited by these 

 geologists. 



Before closing I would like to take exception to the various 

 brief visits paid to certain so-called "typical localities." as the 

 hurried examinations thus made must always lead to confusion. 

 Had Messrs. Pumpelly and Yan Hise written to me I would 

 have been only too eager to accompany them to the many points 

 of geological interest exhibited in this district. It is often so 

 easy then to reconcile seemingly opposite views, whereas a 

 letter in reply, no matter how written, only leads to endless 

 and sometimes useless discussion. 



Aet. XXXI. — Some Convenient Forms of Laboratory Appa- 

 ratus ; by F. A. Gooch. 



[Contributions from the' Kent Chemical Laboratory of Yale College — XVI.] 



Burette Clip. — A simple and effective device to replace the 

 Erdmann float (which has well-known disadvantages) in getting 

 exact burette readings is made by cutting thin springy brass, 

 or copper, or other metal to the form of a letter H, shaping it 

 as shown in fig. 1 so that it will cling to a burette with the 

 cross-bar vertical, and fastening to the cross-bar a fold of white 

 paper ruled longitudinally with a heavy, sharply defined, dark 

 line. The clip may be made to hold firmly to any burette, 

 while capable of easy upward and downward motion, and is 



