1883.] 347 [Annual Meeting. 



Mr. Crosby assisted by Miss Carter has, however, worked over 

 and rearranged a considerable portion of the collections, and they 

 have been greatly improved. 



The collection of Lithology has been considerably enlarged and 

 extended, and that of Petrology also. The latter is in part com- 

 pleted, and placed in one of the large floor cases built for this 

 purpose last year. 



The Dynamical Geology has been enriched by the purchase of 

 three models, one of the topography of the Grand Canon of the 

 Colorado (6 ft.x 6 ft.) and two of the Henry Mountains of Utah, 

 of smaller size. The Historical collection has been worked over, 

 and the labelling and mounting of the whole finished. Much 

 more might be written, but we prefer to wait until it is is ascer- 

 tained whether it is possible to finish the arrangement as it has 

 been begun. 



Botany. 



This department, which is still generously taken care of by Mr. 

 John Cummings, has not received as much attention as usual this 

 year, on account of the occupation of Miss Carter in the work on 

 the Mineralogical and Geological collection. 



The New England Collection of Algae has been greatly in- 

 creased, through the kindness of Mr. F. S. Collins. It is now 

 very nearly complete, containing 202 specimens representing 91 

 genera and 172 species. The algae in the systematic, or general 

 collection have been thoroughly revised, and the synonymy cor- 

 rected to correspond with the latest works, printed generic labels 

 have also been supplied. This collection contains 2528 specimens, 

 representing 250 genera, and 866 species. The blanks are now 

 being filled out from the duplicates, this work being about one 

 third completed. 



Synoptical Collection. 



This department has received a few additions in the shape of 

 glass models of the invertebrates. 



Miss Martin has been employed upon the collection, and has 

 completed preparations of the exoskeletons of a Myriapod, Scor- 

 pion, and Limulus which have been mounted, and are on exhibi- 

 tion. Mr. Henshaw assisted by Miss Martin has nearly completed 

 the selection of the types of Invertebrata which are to be repre- 

 sented in this collection. 



