PERILYMPH 



260 



PERUVIAN 



helios, sun.] The point in the orbit of a 

 planet which is nearest the sun. 

 Perilymph, (per'i-limf). [Gk. peri, around; 

 Lymph, q.v.] A watery fluid, surrounding 

 the semi -circular canals of the ear. 

 Periodic, (pe-ri-od'ik). [Gk. penodos, circuit.] 

 P. stars : those that appear, or vary in mag- 

 nitude, at regular intervals of time. 

 Periodic acid, (per-i-od'ik). [Per and Todic, 

 .i;.] = Hydricperiodate: HIO4; a crystalline 

 acid. 



Periosteum, (pe-ri-os'te-um). [Gk.pm'.around; 

 osteon, bone.] A white fibrous membrane 

 covering bones, and serving for the attach- 

 ment of muscles, &c. 



Peripherie type of animals, (per-i-fer'ik). 

 [Periphery, q.v.] You Baer's term for 

 Radiata. 



Periphery, (per-if'e-ri). [Gk. peri, around; 

 pherOi 1 carry.] The circumference of a 

 curvilinear figure. 



Periscopic, (per-i-sko'pic). [Gk. pen, around; 

 skopeo, I view.] P. glasses: spectacles of 

 concavo-convex lenses, giving a wider field of 

 view than usual. 



Penssodactyla, (per-is-so-dak'ti-la). [Gk. 

 perissos, uneven; daktylos, finger. ]=. A divi- 

 sion of Ungulata: animals belonging to 

 Mammalia, which have an odd digit, such as 

 the horse, tapir, &c. 



Peristaltic, (per-i-stal'tik). [Gk. penstaltikos, 

 drawing together to a centre.] P. movement: 

 by successive waves, e.g., the propulsion of 

 the contents of the intestines. 

 Penstome, (perVstom). [Gk. peri, around: 

 stoma mouth.] A fringe of hair, bristles, 

 &c., round the mouth, used especially of 

 sea-urchins. 



Peritheca, (per-i-theTca). [Gk. pen, around; 

 theke, case.] Envelopes enclosing spore- 

 vessels, found on some fungi. 

 Peritoneum, ( per-i-to-ne'um ). [Gk. peri, 

 around; teino, 1 stretch.] The thin mem- 

 brane lining the viscera and the walls of the 

 abdomen. 



Periwinkle, (per-i-wing'kl). 1. Vincar a plant 

 belonging to Apocynacese. 2. A corruption 

 of petty winkle or whelk. 

 Perlarise. A division of Neuroptera; insects 

 with hairy wings. 

 Perleb's classification of plants- 

 Cell ulares= Acoty ledons. 

 Leafless= Protophyta. 

 Leafy =Muscosse. 

 Vasculares = Cotyledons. 

 Endogens Monocotyledons. 

 Cryptogamia = Fiiicin. 

 Phanerogamia= Ternaries. 

 Exogens = Dicotyledons. 

 With simple perianth =:Monochlamydere. 

 With double perianth. 



Monopetalous and hypogynous=: 



Thalamantnse. 

 Monopetalous and perigynous= 



Calycanthae. 

 Pleiopetalous and perigynous= 



Calycopetalaa. 

 Pleiopetalous nnd 

 Thalamopetalaa. 



Permanganates, (per-man'gan-ats). [Per and 

 Manganate, q.v.] Compounds of perman- 

 ganic acid with bases. 



Permanganic acid, (per-man-gan'ik). [Per 

 and Manganic, q.v.] HaM^O^: the most 

 highly oxidised form of manganic acid. 



Permian, (per'mi-an). [Perm, in Russia.]= 

 Magnesian limestone: the highest of the 

 primary formations, including all rocks above 

 the Carboniferous, and below the Trias, with 

 fossils resembling those below more than 

 those above; contains fossil fishes with hetero- 

 cercai tails. 



Permutation, (per-mu-ta'shun). [Permutatio, 

 the Latin word.] Changes in the order iu 

 which a number of things may be arranged. 

 Ex. a, 6, c may be arranged 6 ways, thus 

 ubc, acb, bac, bca, cba, cab. 



Pernis, (per'nis). [L. pernis, swift.] Honey 

 buzzard : a bird belonging to Falconidse. 



Peroneal, (pe-ro-ne'ai). [Gk. perone, clasp.] 

 Related to the fibula. P. 6one=Fibula. 



Peronospora, (per-o-nos'po-ra). A fungus. 

 P. in/es(ans=Potato-blight. 



Peroxides, (per-pks'idz). [Per and Oxide, q.v.] 

 Oxides containing the largest proportion of 

 oxygen. 



Perpendicular, (per-pen-dik'u-lar). 

 thoroughly ; pendo, I hang.] 

 Generally, at right angles to 

 any given line; specially, ver- 

 tical, at right angles to the 

 horizon. 



Perry, (per'ri). [Poirt, the 

 French word.] The fermented A 



[L. per, 

 D 



juice of the pear. 

 Persea, (pcr-se'a). 



'ersea, (pcr-se'a). A plant be- D, C, perp 

 longing to Lauraceae. P. gratis- dicular; 

 ima=Avocada pear. A - B - ' I0ri - 



Perseus, (per'sus). [Classical.] 

 One of the northern constellations; of which 

 Mirfak. and Algol are the chief stars, and 

 whicb contains several remarkable clusters 

 of stars. 



Persian, (per'si-an). P. apple Peach. P. 

 architecture: a modification, or develop- 

 ment, of Assyrian. P. berries': Rhamnus. 

 P. wheel: awheel having water-buckets on 

 the rim, by means of which water can be 

 raised. 



Persica, (per'si-ka). [Persia.]=Peach-tree=: 

 Amygdalus Persica, a tree belonging to 

 Dru pacese. 



Persicaria, ( per-si-ka'ri-a ). A variety of 

 Polygonum, q'v. 



Perspective, (per-spek'tiv). [L. per, through; 

 specto, I look at.] P. drawing: one made on 

 a surface, so that the objects represented ap- 

 pear to be seen through the surface. Ordi- 

 nary pictorial drawing is perspective, v. 

 Projection. 



Perspiration, (per-spi-ra'shnn). [L. perspiro, 

 I breathe thro"ugh.]=Sweat: an acid fatty 

 secretion made by the skin, containing also 

 scales of the epidermis. 



Peru. JSalsam of P., v. Myrospermum. 



Peruvian, ( per-6'vi-an ). [Peru.] P. ba.t= 

 Vespertilio leporinus. . P. bark: bark of 

 cinchona, v. Quinine. 



