48 



spa-level, being thirty-one days behind Vienna. This difference ex- 

 hibits a regular diminution in each month from the spring to the 

 summer. 



The supplement to the eleventh volume of the ' Jahrbucher der 

 k. k. Central-Anstalt fur Meteorologie und Erdmagnetismus,' con- 

 tains a comparison by M. Fritsch of those epochs in the life of 

 plants and animals in different localities in the Austrian empire, 

 which admit of being accurately determined for the year 1857. 

 These observations include a record of definite phases of vegetable 

 and animal life under the most various local circumstances, and ex- 

 tend as far as possible over the whole flora and fauna. They have 

 been now continued for eight years. It is proposed to continue them 

 till they embrace a period of ten years, when M. Fritsch hopes to 

 deduce from them many important results, a task which will probably 

 occupy him for several years. A memoir on the law of the influ- 

 ence of temperature on the epochs of definite phases of the deve- 

 lopment of plants, taking into account the effects of insolation and 

 moisture, in the c Denkschriften ' of the Vienna Academy of Sciences, 

 vol. xv., is intended as a precursor to this undertaking. 



Professor Zantedeschi is the author of nine papers on Acoustics, 

 published in the ' Sitzungsberichte ' of the Academy of Vienna. 

 1. On the doctrine of the third sound, or on the coincidence of 

 sonorous vibrations, with a remark on the analogy presented by the 

 vibrations which constitute the light of the solar spectrum. The 

 experiments of the author show that the number of vibrations in 

 a given time, of the third sound, is always the difference of the 

 numbers of vibrations of the two given sounds, and is not always the 

 greatest common measure of the two given sounds, as has been 

 asserted by some writers. 2. On the correspondence which sonorous 

 bodies manifest in the resonance of many sounds in one. 3. On the 

 unit of measure of musical sounds, on their limits, on the duration of 

 the impression of the vibrations on the acoustic nerve of man, and on 

 the increase of pitch of the fundamental note in tuning-forks of steel 

 due to a spontaneous molecular change. The principal object of 

 the author is the determination of a fixed note, to which, as to an 

 invariable unit of measure, the notes of different instruments may be 

 referred. The number of vibrations per second which produces the 

 note C is from 2/2 to 27CJ at St. Petersburg; 271 in Naples; 2C8 



