with great force. The beach is steep throughout and there are no outlying rocks to cause any disturbing features. From the Mohaka River to a point three miles beyond the Waihua mouth there are cliffs of a soft marl, the foot of which is just reached by the waves at high tide, but otherwise for the whole distance the beach is merely a gravel bank. Samples were taken in the bed of the Mohaka River three miles from its mouth; from the beach at the mouth of the Mohaka River and at the mouth of the Waihua River 6 miles distant. The other samples were from the bank at the mouth of the Wairoa River, 12 miles from the Mohaka; from Whakaki 24 miles; from the Nuhaka mouth 32 miles; and finally from Waitaniwha at a distance of 35 miles from the point of origin of the gravel, the mouth of the Mohaka River. Description of Samples from Mohaka Beach. (Fig. 5, Table 6). The gravel from the bed of the Mohaka three miles from the mouth has a grading which closely resembles that from the bed of the Tukituki River. The different grades have the same characteristics as in that sample. In other words the coarser pebbles are well rounded, but nearly all of those that are less than 6.3 mm. in diameter are angular. The sample that was taken from the beach at Mohaka was far less sorted than that at Tukituki though it is distinctly different from the gravel of the river bed itself. Many of the larger pebbles already show some flattening while those 6.3 mm. in diameter are already partly rounded, though all smaller ones are most angular with sharp angles. At Waihua, six miles from Mohaka, the gravel is already finer than that at Bay View on the Napier beach and indeed approaches that of Tongoio, 16 miles distant from its source. This greater speed of reduction than on the Napier beach, in comparison with apparent distance of travel, may be due to a slower movement along the beach. The flood tide probably moves more slowly here and the swell washes nearly at right angles to the beach. The gravel has much the same features as that from Tongoio. The grade 6.3 — 3.4 mm. is well worn, the larger pebbles still show a relic of the flattened form but are mostly rounded. A few freshly broken pebbles can be seen among them. The grade 3.4 —2.0 mm. is the dominant size and has a distinctly angular appearance. No suggestion of any flattened form. A few freshly broken pebbles. The grade 2.0 — 0.84 mm. is very angular with many freshly broken pebbles but the angles are usually rounded off. Mouth of the Wairoa River.—The few pebbles that are nearly 6.3 mm. in diameter are flattened but those near 3.4 mm. are rounded, angular form being rare. The grade 3.4 — 2.0 mm. is well rounded; there is no flattening, and angular shape is rare. The grade 2.0 — 0.84 mm. is now dominant, much more angular than the coarser grade, but angles generally well rounded; fresh angles are not common. This makes a great contrast with the same grade from Waihua. In this sample, as in that from Waihua, finer matter than that of the last grade is practically absent. In this even-graded gravel the coarsest pebbles have a diameter five times larger than the smallest.