SIMPLE MICROSCOPES. Ill 



book-folding case, the names on which can be read oil' at 

 a glance, are particularly well selected. Many of the cases 

 are so arranged as to form complete sets of certain classes 

 of specimens admirably suited for educational purposes, and 

 also for the elucidation of general and particular principles ; 

 as, for instance, the various parts of an insect, to show 

 peculiarities of structure for the illustration of entomo- 

 logical lectures, the same for botanical, anatomical, &c. 

 Many of our drawings have been made from Mr. Wheeler's 

 excellent specimens. 



Mr. Piper, of the Old Change Microscopical Society, 

 devised a convenient, cheap, and portable object-case. It 

 is a compact oblong paste-board box, made to contain six, 

 twelve, or twenty-four shallow trays, with six or twelve 

 divisions just the size of the ordinary glass slides. The 

 objects lie fiat in these trays, which pack one above the 

 other. For handiness, neat packing, facility of finding 

 and reading off names of objects, this case cannot be 

 surpassed. It is but right to add, that it is adapted to 

 the use of those whose aim is the economically useful 

 cabinet for storing and classifying objects. This " uni- 

 versal" object-case is sold by Baker, Holborn. 



Several forms of simple microscopes have been devised 

 for field use under various designations, such as " Diatom 

 Finders," &c. One of the most useful little instruments 

 of the class is that described by Mr. J. N". Tomkins, in 

 the Trans. Micros. Soc. vol. vii. p. 57, 1859. Another 

 was invented by Dr. W. Gairdner of Edinburgh, and made 

 by Mr. Bryson of that city, neatly packed in a case for the 

 waistcoat-pocket. Want of space will not permit us to 

 enter further into this department, nor ean we go into 

 a critical examination of the productions of numerous 

 well-known makers of microscopes ; as, for instance, the 

 Educational Microscopes of Messrs. Smith and Beck, of 

 Cheapside ; Mr. Browning, 111, Minories ; Mr. Matthews 

 of Portugal Street ; Mr. Dancer of Manchester ; Messrs. 

 Abraham of Liverpool ; Mr. King of Bristol, &c. — all of 

 whom have obtained a deservedly high reputation for 

 their convenient forms of educational and other well- 

 manufactured instruments. 



