19 



The last pointing was made verj near llie end of the field and 

 has therefore a smaller weight than the others. Taking the mean 

 of the three with weights J, 1, i we find: 0^= + 13° 12' 12"30 ; 

 reducing to the mean of the two circles and the fonr positions of 

 the instrument we get: d = -|- 13° 12' 12"41 ; finally we find for 

 the declination 



on r> ,-M'c^r. i Timc of oliscrv . 

 reduced to Auwkrss system : d= + 13 12 12 25 f 001,1 r„,o« 



„ Newcomb's „ :rf=:-|-13° 12' 12 37 ,, .,, ,, 



' ' M. i . drcenw. 



A comparison with the Nautical Almanac gives: 



Observ.— Calcul. : Auwers's system : — 3". 58 



Nkm'comu's ,, : — 3".4G. 



II. Transit of Merci'iiy on Novkmukk 7 1914. 



Using the great refractor of the observatory (aperture 266 mm.) 

 I tried to observe the moments of inner and outer contact. At the 

 first two coiilacls the sky was clouded over, so that only the last 

 two could 1)0 oliservod. I'he |)Owor used was 170. As Ihc moment 

 of inner contact I took the breaking of the thread of ligiil. 

 The times observed are 



last inner contact: 2'' 6"i 24^8 M.T. (ireeuwich 

 „ outer „ : 2 8 43 

 A comparison with the Nautical Almanac gives as Ihe diircrciu-e 

 calculation minus observation : 



last inner contact -)- ]6\7 

 ,, outer ,, -J- ll^*. 

 Leiden, April 1915. 



Anatomy. — '^Oii /he s/niclure of /he iiniseu/id- tilidtntiiiiKl ma! I 

 of' Priinn/cs." I'.y W. .\. Mi.isiU'.RCi (Commiuiicaled by Prof. 

 \h\ L Boi.K). 



((Inmmunicati'il in tlii' meeling ot' April !23, lülü). 



In the publications relaliiig to the myology of Primates, ihc 

 muscles of llii' abdomen ai'c usually discussed very superficially, and 

 where that discussion is a more elaborate one, that gi'ealer elaboration 

 is as a I'ule restricted to an excessively accurate description of the 

 origins of these muscles. Less attention however is paid to the way 

 in which these muscles contribute to the formation of the sheath 

 of the M. rectus; no publication is even known to me, in which 



2* 



