THE MICROSCOPE. 73 



and lie is indebted to its aid for much valuable information 

 on the plants which flourished during the carboniferous 

 era. The student should therefore procure a microscope, 

 and commence a series of independent observations. The 

 best microscopes are those made by Messrs. Powell and 

 Lealand, Mr. Ross, and Messrs. Smith and Beck, in London ; 

 the object-glasses made by these gentlemen are of a first- 

 rate class, and their penetrating and defining powers have 

 never before been equalled; object-glasses made by the 

 English opticians are most desirable. 



Mr. Thomas King, of Bristol, makes beautiful instruments; 

 his small portable microscope, and his educational one, 

 are well suited for geological and all other purposes. A 

 series of objects illustrative of palaeontology, may be obtained 

 from Mr. Topping,* Mr. Darker, f and others: when the 

 student has made himself acquainted with the character of 

 bone, teeth, shell, and wood, he may proceed to make thin 

 sections of these objects, which must be mounted in Canada 

 Balsam; he will soon make a valuable collection by this 

 inexpensive process. 



* New Winchester-street, Pentonville Hill, 

 f* Paradise-row, Lambeth. 



