14 Be ALE, on a simple form of Portable Microscope. 
low. In fig. 4 the telescope tube is drawn out, and the in- 
strument arranged for examining living animals, &;c., in a 
vivarium. 
The various portions of the microscope are readily sepa- 
rated from each other, and can be packed in a small case. 
The weight of the entire instrument, with case, &c., will 
probably not be more than six pounds. Mr. Matthews, of 
Portugal-street, Lincoln's Inn, thinks that this microscope, 
without powers, can be well made for five pounds, or even 
less. There is some vibration in the body of the instrument 
which I have in use, but the lever movement appears likely 
to answer well for all powers below half an inch ; the motion 
is even smoother than would be supposed. Several slight 
alterations in the mechanical parts of the instrument have 
been suggested, and will doubtless add to its efficiency. As 
a travelling microscope, especially for sea-side work, this 
arrangement will I think be found very useful, and is not likely 
to get out of repair. 
