692 MANUAL OF NATURAL HISTORY. 



sional observations include notice of such pheno- 

 mena as are not of regular occurrence, such as un- 

 usual barometric disturbance, electric storms and 

 other appearances, squalls, hurricanes, hail-storms, 

 fogs, water-spouts, halos, mock-suns, zodiacal light, 

 the aurora, shooting stars, meteors, &c. Should it 

 be the lot of the traveller to encounter one of those 

 terrible circular storms, named " Cyclones/' he should 

 carefully note his position, the direction of wind, or 

 any sudden changes which may occur, on which 

 points much information may be obtained from the 

 works of Colonel Reid or Mr. Piddington. 



In conclusion, there are several instruments and 

 tools which, if provided, may very probably be found 

 of extreme service to the travelling naturalist, among 

 which we would particularly mention the " Micro- 

 scope/' as being nearly indispensable. Those we espe- 

 cially recommend are made by Oberhause, of Paris, 

 and they excel all others in portability, cheapness, 

 and general efficiency. One magnifying from 30 to 

 450 diameters may be obtained for £5 in France, or 

 about ^6 in this country ; these contain three eye- 

 pieces, two or three object-glasses, and a micrometer, 

 which, with the stand, &c, are packed in a box 8f in. 

 long, 5 in. broad, and 3^ in. deep. It is a pity that 

 this maker does not establish an agency in Britain, as 

 his microscopes are now much employed here, and are 

 excelled by none in the facility of their application, or 

 the correctness of their revelations. Another very 



