The Microscope. 367 



ence) the difficulty may be obviated. The light ring being finished, 

 see again that no glycerin has escaped, and then lay away to harden. 

 The cover-glass will now be found firmly fixed, and as many layers 

 of cement as necessary may be added. It is well to put on several 

 of these layers, a sufficient number to at least hide the edge of the 

 cover. 



The choice of cements can depend on the individual taste. The 

 glycerin cannot affect them, and "the balsam is rendered innocuous 

 through hardening. If the reader has never seen a cell- mount, it is 

 advisable to procure one as a pattern before undertaking their man- 

 ufacture. Much patience and practice will be required to attain 

 perfection in the art. 



The follower of these lessons is now able to perform the more 

 simple operations requ^ired in the preparation of microscopical 

 objects. The purpose of these papers has, therefore, been accom- 

 plished, and tW&y will be discontinued. The writer is perfectly well 

 aware of their imperfections, but feels that these will, to a great 

 extent, be atoned for by the gentlemen who take up the thread of 

 this departmeet with the coming year. He is informed by the editors 

 that Dr. W. P. Manton will contribute a series of papers on the 

 elementary microscopical technique of embryology, and that Dr. 

 Frank W. Brown will take up a course in histology, in which, of 

 necessity, there will be much of technique new to this department. 



EDITORIAL. 



SPECIAL NOTICE. 



^]| T'lTH this issue of The Miceoscope the special business aiTange- 

 ' ^ ment between Messrs. D. O. Haynes & Co. and the editors 

 and proprietors is, by mutual consent, dissolved. 



During the year past our publishers have done all in their 

 power to advance the interests of this journal and have been liberal 

 in both time, money and personal energy, so that to-day The 

 Microscope stands at the head of this class of publications, and 

 circulates in every state and territory in the United States and 

 largely in Canada, as well as in many foreign countries. While we 

 regret that the pleasant relations which have existed between the 

 editors and D. O. Haynes & Co., publishers, are thus brought to a 



