470 



Analyses of Boohs. 



[Dec. 



Diurnal 7'ising tide from 

 4—5 A.M. to 9 — 10 A.M. 



Poonah . . + '0445 

 Royal Society -j- -0185 



Nocturnal maximum rising 

 tide from 4—5 p.m. to 10 — 1 1 



P.M. 



Poonah . . + -0884 

 Royal Society + *0272 



These tides occur within the same limited hours as in America 

 and Europe, the greatest mean diurnal oscillations taking place in 

 the coldest months, and the smallest tides in the damp months of 

 the monsoon ; while at Madras the smallest oscillations are in the 

 hottest months, and in Europe it is supposed the smallest oscillations 

 are in the coldest months. The diurnal and nocturnal tides are 

 regular whatever the thermometric or hygrometric indications may 

 be, or w^hatever the state of the weather ; storms and hurricanes 

 only modifying them. The mean diurnal oscillations at Poonah, 

 1,823 feet high, are greater than at Madras. At a higher level than 

 Poonah, the diurnal tides were less, while the nocturnal tides were 

 greater. The maximum mean pressure of the atmosphere is greatest 

 in December or January, then gradually diminishing until July or 

 August, and subsequently increasing to the^ coldest months. The 

 annual range of the thermometer is less in Dukhun than in Europe, 

 but the diurnal range is much greater. The annual mean dew point 

 is higher at 9*^ 30' than at sunrise or 4 p.m. The highest dew points 

 occur in the monsoon, the lowest in the cold months. The rain in 

 Dukhun is only 28 per cent, of the rain in Bombay (Records, vol. i. 

 p. 29J..) ninety or a hundred miles to the east. Fogs are rare, and 

 are always dissipated by 9 — 10 a.m. Circular and white rain- 

 bows occur ; solar radiation is very great; the atmosphere is very 

 opaque in hot weather, and the mirage is distinct. 



II. — JVew Works. 



1. Lehrbuch der Geologie und Geognosie, von Dr. R. C. von Leon- 

 hard. V. Lieferung. Stuttgart, 1834. 



This work has especial reference to the vicinity of Stuttgard. 

 The preceding part treats of the general proportions of terrestrial 

 bodies ; the heat of the earth, with its density and magnetism. The 

 fifth number comprises the formation of hills and mountains and 

 vallies, mountain-passes, plains, and the bottom of the sea. The 

 sixth part will contain an account of air and water, under the divi- 

 sions of oceans, atmospheric vapour and dew, wells, rivers, seas, ice, 

 snow, &c. The seventh portion will be occupied with the changes 

 produced on the earth's surface by the chemical action of water,— the 

 encroachments of the sea, and action of the atmosphere upon rocks. 



2. Lehrbuch der Botanik, von Dr. G. M. BischofF. II. Band. 



This volume begins with the anatomical structure of plants; their 

 vessels, roots, stem, bark, fruit, seed ; and terminates with an account 

 of their chemical com^iosition. 



