VI GON TF EON Tes 
M. ARRECTORES PILORUM (A simple method to obtain a curve of the con- 
traction of the). 81. 
Mathematics. JAN DE Vries: “Involutorial correspondences (2,2) of the 
first class, 12. 
— J. G. VAN DER CorpuT: “On an integral notion of DENJOoY”. 131. 
— J. A. SCHOUTEN and D. J. Struik: “On curvature and invariants of 
deformation of a Vm in Vn’. 146. 
— W. vaN DER WoupE: “On the path of a ray of light in the field of 
gravitation of a single material centre”. 187. 
— J. W. N. re Heux: “Explanation of some interference-curves of 
uni-axial and bi- axial crystals by superposition of elliptic pencils”. 
(Second paper). 195. 
Medicine. I. K. A. WERTHEIM SALOMONSON: “Simple and alternating foot- 
clonus”’. 47. 
Mercury (The optical investigation of surface layers on) and a more 
refined method of observation with BABINET's compensator. 108. 
MERIDIAN—OBSERVATIONS (On a change with the declination in the person- 
al equation in). 168. 
Mor (W. E. pe). On hypotriploid dwarf-hyacinths derived from triploid 
Dutch varieties through somatic variation. 251. 
MOLECULES (The condition of motion of the) in space. 198. 
— (On the law of force between the) of mon-atomic substances. 294. 
MOLENGRAAFF (G. A. F.) presents a paper of Dr. B. G. EscHeR: 
“On the hot lahar (mud flow) of the valley of ten thousand smokes 
(Alaska). 282. 
MUSCLE sound in birds. 78. 
— (Concerning an isolated) of the ciliary body of the pigeon’s eye, 
situated near the eye-split. 123. 
— (On the action of the novocain on the tonus of the skeletal). 185. 
MvcuskeENns-(L. J. J.). The myoclonic reflexes. 280. 
Myoc onic reflexes (The). 280. 
Novocain (On the action of the) on the tonus of the skeletal muscle. 185. 
Onnes (H. KAMERLINGH) presents a paper of Prof. W. H. KEEsom: 
“On the calculation of the molecular quadrupole-moments from the 
equation of state.” 162. 
OPTICAL INVESTIGATION (The) of surface layers on mercury and a more 
refined method of observation with BABINET’s compensator. 108. 
Orit (The) of Bu 6832 = & 1834. 72. 
Palaeontology. Euc. Dusois: “On the cranial form of homo neandertalensis 
and of pithecanthropus erectus, determined by mechanical factors.” 313. 
PANNEKOEK (A). The local starsystem. 56. 
