A considerable number of papers prepared for this number have 

 been necessarily delayed, on account of the limited space allotted, and 

 yet our limits have been extended. The lithographs were executed by 

 the editor and printed by a process making them cheaper than any other 

 available, and any failure to realize the ideal of such work will, no 

 doubt, be pardoned on this account. 



For information relating to the departments here represented, the 

 reader is referred to the advertisement appearing elsewhere. The fact 

 that the chemical laboratory has afforded us no material for this num- 

 ber, may be attributed to the change in administration in that depart- 

 ment, occasioned by the death of the lamented Prof. Osbun. 



