ACADEMY OF SCIENCES. 207 



-1870. Ov. Kong. Dansk. Yiilensk, Selsk. Forh. Naclir. K. Ges. Wiss. d. 

 Georg. Aug. Univ. Gottingen, 1870. Schriit. Ver. Vcrbr. Nat. Kcuntn. 

 AVien., 1868-70, 9th Bd. Corrcsp. Xatiirf. Voreins zu Riga, 1870. Der. ge- 

 genart. Staiide, des Seident. v. Dr. J. J. Rein, Frankfurt, 18()8. Verb. 

 Schvveiz, Natiiribrch. Ges. Solothurn., 1870, Abb. heraus:^. Naturw. Verein 

 zu Bremen, Bd. II, 1871. Die ausgest. u. aussterbend. Tliiere der jungst. Erar 

 periode, Wien, 1870. Kurz. Ber. Ergebr. nein. AusH. ober Agram an den 

 Plattensee. Kat. Biblio. Batav. Gen. Wetensch. und Kat. der Ethnol. af'd. 

 Mus. Genoot^^cliap. Batav., Batavia, 1870. Froc. Phil. Soc. Gkisgow, VI, 

 No. 4, YII, Nos. 1-2. Six Charts, Sveriges Geologiska undersokuung. 



Dr. Hewston exhibited a forked limb of a mangrove tree, en- 

 crusted with a species of Ostrtea, of large size, collected by his 

 son at Magdalena Bav, Lower California. 



Dr. Blake remarked, that he had recently noticed in a deep 

 water-course back of the Mission Dolores, the trunks of large red- 

 wood trees (^Sequoia sempervirens) ^ buried to a depth of thirty feet 

 below the surface. 



Mr. C. D. Gibbes presented a communication upon meteorological 

 observations which he had made in the Sierra Nevada in the winter 

 of 1862-3. His locality was at Bed Mountain, the commence- 

 ment of the eastern summit range which incloses Lake Tahoe, and 

 in latitude 38 deg. 42 min.; longitude, 119 deg. 56 min. It has 

 an elevation of about 9,000 feet above the sea ; but his observa- 

 tions were made about half way up the mountain. In August, 

 1861, he had discovered on this mountain upon the southeast face 

 of rocks, bushes and large pines, numerous small blood-red patches, 

 which looked as if from some wounded animal ; but were found over 

 an extent of twenty or thirty acres, and on the trees, as high as 

 could be seen ; they seemed as if driven and deposited by a storm 

 from the southeast, but no specimens were obtained for examination 

 and identification. At 8,000 or 9,000 feet, he frequently noticed 

 the Protococcus nivalis, or "red snow." 



The meteorological observations show that the thermometer did 

 not fall below 8 deg. during the winter ; that the southwest winds 

 gave bad weather, mth gales, snow and clouds ; west and north- 

 west winds, brought clear weather. The annexed table gives the 

 characteristic features of the winter. There was no rain through- 

 out the given six months ; and there were forty-six clear days and 

 nights out of ninety-nine. In November, when the weather was 

 clear, the record notes the days as " clear and pleasant ;" and in 



