188 CELL-CONTENTS OF CLOSTERIUM LUNULA. 



of Desmidieae in which there is a terminal vesicle. Of its reality in 

 Closterium lunula any careful observer may convince himself, provided 

 he examine healthy specimens of the species. 



I hope to recur to this subject at a future time ; meanwhile it is to 

 be distinctly noted that the flow of cell contents, while it is actuated by 

 the contractile motions of the vesicle, is a phenomenon wholly distinct 

 from the swarming of the larger particles within it, the functions of 

 which are, I fear, still hidden in entire obscurity. 



MOUNTING BOTTLE FOR MICEOSCOPISTS. 



My drop-bottle for balsam, damar, &c, is made as follows : — Take a 

 morphia bottle, and with a rat-tail rile, bore a hole through the centre 

 of its cork, through which pass a piece of glass tubing, drawn to a point 

 at the lower end and somewhat expanded at the upper. Cover the 

 upper end with a rubber bulb ; a nipple with the opening closed by 

 means of a heated rod will answer. Put the medium into the bottle, 

 insert the cork, and it will be air-tight. Do not squeeze the bulb while 

 the cork is in the bottle, for the tube and bulb would then fill with 

 the medium when the pressure is withdrawn, thus rendering the 

 apparatus useless. When cement is desired, remove the cork, squeeze 

 the bulb till as many drops as may be required are obtained, and return 

 the stopper. By care, the cork and neck of the bottle will be kept clean, 

 and the bottle always ready for use. 



Charles H. Cockey, M.D., 



In " American Monthly Microscopical Journal " for July. 



ON DEEP BORINGS IN THE SOUTH-EAST OF 

 ENGLAND.* 



BY W. JEEOME HAKRISON, F.G.S. 



The mechanical inventions and improvements of the last few years 

 have reacted upon the sciences which gave them birth, enabling us to 

 undertake operations and to make discoveries which we could not hope 

 to do without such aids. Thus, it is now a matter of comparative ease 

 and certainty to make a vertical hole in the earth at any point of from 

 3in. to loin, in diameter to a depth of 2,000ft. ; the cost of such an 

 operation being from £2 to £5 per foot in depth. On the system adopted 



* For the plate accompanying this paper we are indebted to the kindness of Mr. 

 John Hopkinson, F.L.S., F.G.S. , the Hon. Sec. of the Watford Natural History 

 Society and Herts Field Club.— Eds. M. N. 



