NEW PHILOSOPHICAL INSTRUMENTS, 



MADE BY 



ANDREW PRITCHARD, 



162, FLEET STREET, LONDON. 



PRITCHARD'S POCKET MICROSCOPE. 



THIS Instrument is very steady, its construction simple, and not liable to derange- 

 ment. It is furnished with rack-adjustment, concave mirror, and four magnifiers. 

 Price, in case, 38*. 



PRITCHARD'S GARDEN-FRAME THERMOMETER 



Is inclosed in a strong glass case, mounted with brass, so that it can be inserted into 

 the earth without danger. It will be found of great value for Mushroom beds, and 

 strikine: of delicate FjQger_Plants in frames. It is so graduated, that any person 



NOTICE. 



Mr. PRITCHARD having been for several years engaged in prepar- 

 ing Drawings and Specifier: . :. :onts for new Inventions, 

 offers his assistance to PA ^rs, and 

 others in the various branches connected with Patent b . 

 especially in ascertaining the novelty of Inventions id 

 the Titles for Patents in soliciting Patents making T 

 and Specifications for Enrolment, and enter: i 

 vent others from obtaining Patents wr.". v, 



LONDON: 162, FLEET STREET. 



En tije 



(Price to Subscribers, 24s. ; to Non-Subscribers, 30s.) 



A HISTORY OF INFUSORIA; 



LIVING A X D FOSSIL; 



ARRANGED ACCORDING TO THE 



DIE INFUSIONSTHIERCHEN OF C. G. EHREXBERG. 



ILLUSTRATED BY 



SEVERAL HUNDRED ACCURATE COLOURED ENGRAVINGS OF THESE CURIOUS 

 CREATURES, HIGHLY MAGNIFIED. 



BY ANDREW PRITCHARD, 



Author of the " Microscopic Illustrations," " Natural History of Animalcules," $c. 



This Work will contain descriptions of the external characters, internal structure, 

 instincts, habits, and locomotion of these interesting living atoms, forming a complete 

 Manual on this subject ; and it is believed will become of deep interest, not only to the 

 physiologist, microscopic and general observer, but also to the Botanist, as contain- 

 ing accurate figures of many creatures hitherto considered as belonging to the vege- 

 table kingdom. 



Subscribers' names received at 162, Fleet-street, London. 



